Explosive compound for primers and detonators



Fatentecl Get. M5, 192%,

were state when HANS RATHSBURG, 0F FURTH, GERMANY.

EXPLOSIVE COMPOUND FOR PRIMEBS AND DETONATOBS.

Ito Drawing.

T 0 all whom it may concern:

Be it known that I, HANS RATHsBURe, a citizen of the Republic of Germany, residing at Furth, in Bavaria, Germany, have invented certain new and useful Improvements in Explosive Compounds for Primers and Detonators, of which the following is a specification.

This invention relates to a new and improved initial primer or detonator and to a process for its manufacture. It is well known that fulminate of mercury hitherto employed in primers or detonators has many disadvantages. Among others it has a destructive influence upon aluminium, it is easily deadened by pressure, it is very uncertain in its action, especially at the low temperatures of liquid air, and it soon deteriorates when stored in damp places. Substitutes for fulminate of mercury which have recently been employed are likewise not free from objections.

It has now been found that the salts of tetrazole (CH N and its derivatives, ow-

ing to their properties, are capable of relacing fulminate of mercury and other 4 initial explosives hitherto employed either entirely or partly, according to the object for which they are employed. The most suitable substances are: the alkali, the earthy alkali, and the heavy metal salts of tetrazole, (CI-LN), tetrazoleazoimid or diazotetrazoleimid (G a z o t e tr a z ole C H N oxyazotetrazole C. ,H ON, diazoaminotetrazole (OJ-LN diazotetrazole (CN bistetrazole (C,H,N,), furthermore the salts of phenyltetrazolecarbonacid (G H O 'NJ, methylmercaptotetrazole (C HALS), substituted dioxytetrazoles, as phenethenyldioxytetrazol (C HQ NJ, B- naphthenyldioxytetrazol (C,,H,O 'N,), 'phenylglycolendioxytetrazole C H O NQ and also benzenyldioxytetrazol (QH OJL) meta-nitrobenzenyldioxytetrazol (C,H,O,N,), para tolenyldioxytetrazole (G,H,O,N,), as well as similar derivatives and substitution products of tetrazole. The salts of the stable triazole, as in Beilsteins Handbuch der Organischen Chemie 3rd ed. vol. 4, page 1098, may also be employed.

As some of the referred to substances are or recent discovery, attention is directed to applicants corresponding British Patent 185,555, accepted Sept. 14, 1922, in which the structural diagrams and a. method of manufracture, of each substance, is set forth.

Application filed August 22, 1921.

in any Serial No. 494,386.

The salts of these'tetrazole combinations have various advantages over the known initial bod es and priming agents, among whlch may especially be mentioned the property to be stored for any length of time without deterioration. It is already known from the literature on this subject that the tetrazole ring is very stable against oxidizmg agents and is only split up by concentrated mineral acids at high' temperatures. The heavy metal salts of the tetrazoleazoimids, for instance, are therefore scarcely attacked by strong acids or strong lyes, 1n contradistinction to the ease with which heavy metal azides are attacked.

The new explosives which also have the i advantage that they can sustain high pressures without injury, and ca-n b fi ormed into pressed bodies are, for instance, in the manufacture of blasting cartridges, mixed with one another or with known explosives or priming ingredients as addition.

As an example, for a charge for blasting cartridges the following may be used:

1.00 g. tetranitromethylaniline (tetryl),

0.15 g. leador cadmium-tetrazylazide,

0.15 g. azotetrazole lead.

An increase in the safety of handling the tetrazole derivatives which have an extremely high piercing force may be obtained known manner, as for instance by granulating them with paratline or resin dissolved'in benzol. xylol, carbon tetrachloride or the likeyif desired, and with an admixture of corkmeal, if desired.

In order to combine the valuable properties of diflerent bodies as, for instance, high sensitiveness to ignition, a good power of transmitting flames, a greater specific gravity and in order to obtain in this way universal primers or detonators which can be used for blasting cartridges as well as for been found out.

of the tetrazole compounds as blasting agents have not been known hitherto. Es-

pecially the fact that even the smallestquantities of the most explosive of these bodies for instance, tetrazylaz1des have an excellent initiating action, has never before tained that of these substances 1 to 2 milligrams are suflicient to bring nitro pentaery i 'this invention by charging ordinary fuses thrit to full detonation. They thus surpass fulminate of mercury in their ignition initiating action to a quite extraordinary degree. Other tetrarole'bodies as, for instance; the salts of the azotetrazole also have an advantage over the known explosives as they are of aclear yellow colour, but do not themselves produce a stain. Furthermore .in their piercing force they a'lso'surpass the salts of known nitro-bodies, as lead trinitroresorcinate and others, which can only be made light coloured with greatdifliculty, which is a disadvantage in their manufacture and application.

of main importance.

It has now been ascerthe alkali salts and the silver'salt are de scribed, while for the practical application in the'arts, the lead and cadmium salts are Tetrazole and-itsderivatlves can equally well be used for Flobert cartridges and similar ammunition in which the primer or detonatoryacts at the same time as the propelling agent, and also for liquid air cartridges and similar munitions. Theordinary phlegmatizing agents may also be added.

Detonating fuses with the usual Wrappings may be manufactured according to with the salts of tetrazole or its derivates either by themselves or mixed together or mixed with othervexplosives, if desired, to-

gether with a suitable phlegmatizing agent.

' What I claim as my invention and desire to secure by Letters Patent is:

1. A priming composition for detonating purposes comprising a salt of tetrazole.

2. A priming composition for detonating purposes comprising a saltof a tetrazole derivative.

In testimony whereof I aflix my signature.

HANS RATHSBURG. 

